40055101TH Rev.4
484 /
3-4
TEL-W2D circuit diagram
TEL-W2D board is for the Germany version only.
1)
Speech IC
General functions of the speech IC are as follows:
•
Basic speech functions included.
•
Separate receive pre-amplifier with signal output terminal
•
Separate receive power amplifier input terminal, cause it is possible to mixing input.
•
Balanced input for microphone input to provide immunity to common mode noise.
•
MF pre-amplifier input terminal is possible to mixing input.
•
Dial pulse waveform improvement circuit included.
•
Manual pad function included.
•
The transmit, receive, and DTMF amplifiers are provided with AGC in accodance with
the line circuit.
2)
Sending Level Adjustment
The sending level can be adjusted by resistor R55 connected in parallel with the section in
front of the transmitter. Increase the resistor value to lower the sending level, and decrease
the value to raise the level.
3)
Receiving Level Adjustment
The receiving level is determined by the resistor value of R35. Decrease the resistor value
of R35 to lower the receiving level, and increase it to raise the level.
4)
Frequency Response Adjustment
The high range frequency response of the transmitter is determined by the capacitance of
C61. Increase the capacitance of C61 to lower the high range level, and decrease the
capacitance to raise the high range level. The low range frequency response is determined
by the capacitance of C36 and C37. Increase the capacitance of those capacitors to raise
the low range level, and decrease the capacitance to lower the level. When the capacitance
of C36 and C37 are changed, both capacitors should have the same value.
The high range frequency response of the receiver is determined by the capacitance of C29.
Increase the capacitance of C29 to lower the high range level, and lower the capacitance to
raise the level. The low-range frequency response is determined by the capacitance of C26.
Increase the capacitance to raise the low-range level, and lower the capacitance to decrease
the low-range level.
5)
Side-Tone Adjustment
The side-tone level is determined by the values of R19, R22 and C16.
Note: Changing the side tone level setting affects the sending and receiving levels, the
verification and readjustment of the sending and receiving levels, and the verifica-
tion and the readjustment of the side tone level are required.
6)
DC V-I (voltage-versus-current) Characteristics Adjustment
The DC V-I characteristics can be changed by mounting or not mounting D10 and D11.
When D10 and D11 are mounted the DC V/I value is raised. When these diodes are deleted
the DC V/I value is lowered. R202 is a 0
Ω
resistor, which is mounted when D10 and D11
are not being installed.
Summary of Contents for B4100
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Page 545: ...40055101TH Rev 4 545 54 SECTION 1 CABINET ASSEMBLY FAX NIP FX048...
Page 548: ...40055101TH Rev 4 548 SECTION 2 UNIT PRINTER...
Page 550: ...40055101TH Rev 4 550 SECTION 3 UNIT 048 OPE PANEL...
Page 552: ...40055101TH Rev 4 552 SECTION 4 OPEPANEL OPERATION PANEL ASSEMBLY...
Page 554: ...40055101TH Rev 4 554 SECTION 5 FRAME ASSEMBLY SCANNER L...
Page 556: ...40055101TH Rev 4 556 SECTION 6 PLATE ASSEMBLY SCANNER B...
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Page 560: ...40055101TH Rev 4 560 17 16 15 10 SECTION 8 FRAME ASSEMBLY SCANNER U...
Page 562: ...40055101TH Rev 4 562 13 SECTION 9 COVER ASSEMBLY TOP...
Page 564: ...40055101TH Rev 4 564 SECTION 10 PLATE ASSEMBLY BASE...
Page 569: ...40055101TH Rev 4 569 SECTION 12 PRINTER HEAT ASSY...
Page 571: ...40055101TH Rev 4 571 SECTION 13 CABLES...
Page 574: ...40055101TH Rev 4 574 SECTION 1 CABINET ASSEMBLY...
Page 576: ...40055101TH Rev 4 576 SECTION 2 CONTROL PANEL ASSEMBLY OKIFAX 5200 5300...
Page 577: ...40055101TH Rev 4 577 SECTION 2 CONTROL PANEL ASSEMBLY OKIFAX 5500 5600...
Page 579: ...40055101TH Rev 4 579 SECTION 3 PRINTER ASSEMBLY...
Page 582: ...40055101TH Rev 4 582 SECTION 4 BASE ASSEMBLY 30 37 38...
Page 585: ...40055101TH Rev 4 585 SECTION 5 SCAN UNIT...
Page 587: ...40055101TH Rev 4 587 SECTION 6 PAPER GUIDE U ASSEMBLY...
Page 589: ...40055101TH Rev 4 589 SECTION 7 CABLES 10...
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